Pump for inflating pneumatic tires



May 20, 1930. c. D. STEEL PUMP FOR IFLATING PNEUMATIC TIRES l* Filed Feb. 14, 1929 B'S'ets-sheet 1 uw "im V/ May 2o, 1930. C. D, STEEL 1,759,287

PUMP FGR INFLATING PNEUMATIC TIRES Filed Feb. 14, 1929 y 2 Sheets-Sheet 2 Patented May 20, 1930 UNITED STATES CHARLES nnNToNsTEEL, or LONDON, ENGLAND PUMP FOR INFLATING PNEUMATIC TIRES AppIcation filed February 14, 1929, Serial No. 339,889, and in Great Britain .Tune 18, 1928.

This invention relates to power-driven ypumps for inflating pneumatic tires on a motor-driven vehicle of the kind wherein a friction disc on the pump is arranged to be driven by a road wheel which has been raised olf the ground and is driven by the engine.

The invention has for itsobj ect to provide an improved construction of pump of the kind referred to which can be readily brought into use and detached, as required, and which obviates the use of manual power for holding the friction disc in driving engagement with the road wheel.

According to the invention, there is-provid- '15, ed the combination of a power-driven pump for inflating pneumatic tires 'on a motordriven vehicle', pivotally detachable to the vehicle at orftowards one end thereof, driving means comprising one or more friction discs 2@ (e. g. a pair thereof) to be frictionally driven by a road wheel of the vehicle, and means for swinging the pump about' its `pivotal attach-` ment towards the road wheel to press the one or more friction discs into, driving Contact therewith. It is thus only necessary to jack up the end of the vehicle, press the friction wheels into contact with a road wheel, and start the engine running, when the pump can be driven frictioiially from one of the road wheels and used for iniiating the tires of the other road wheels.

According to a feature of the invention, the means for swinging the pump about its pivotal attachment is a lifting jack that may be mounted to swing about the axis of rotation of the said one or more friction discs from an operative position in which it can rest on the ground into an inoperative position, in which it can be held by any convenient means.

Conveniently, the pump with its driving means is arranged to be mounted to turn substantially in the vertical plane ofthe driving road wheel about a pivot journalled in a bracket xed to the underside of the running board.

Other features of the invention are described hereinafter and pointed out in the claims. Y

One embodiment of the invention is diagrammatically illustrated by way of example in the accompanying drawings, wherein Figure 1 is a vertical longitudinal section through a pump and driving means therefor according to the invention; f

Figure 2 is a bottom plan view of the pumpy sholwn in Figure 1., some parts being omitted, anc i Figure 3 is a side elevation of a motor vehicle having applied to it the pump shown in Figures 1 and 2.

Like reference characters designate like parts `throughout the several views.

Referring first to Figures 1 'and 2, the frame of the pump is a casting 10 in the form of a bar of substantially rectangular section about one foot long but channelled at intervals to reduce its weight. This bar 10 has a pair of friction discs 11 each in the form of a disc crank at one end, and at' the other end a hole 12 parallel with the axis of rotation of thel discs. vA short horizontal shaft 13 is car'- riedin the frame at the latter end near said hole, andparallel therewith. Two pump cylinders 14 each having a plunger are arranged one at each side of the frame. 'These cylinders arejournalled at one end on the shaft 13 as shown at 15, andfhave their other ends provided each with a sleeve 16 constituting a long bearing, through which the rod 17 of the plunger extends to a disc crank 11.

A bearing bracket 20`of inverted U-section is provided for permanent attachment by a bolt or otherwise to the underside of the running board adjacent a rear road wheel 21 of amotor-driven vehicle as indicated in Fig'- yure 3,'and a pivot-pin 22 carried by the lbracket 2()` and passing through the hole 12 in the frame serves to mount the pump on the running board so thatlitrcan swing in the Vertical plane of the road wheel 21 to bring the friction, discs 1j1 into and out of engagement with the latter. I

At a situation on the frame between the shaft 13 and the friction discs 11 is pivotedy r illustrated the middle of the bar 10 has a vertical slotl 26 whereof the side walls have teeth 27 on their lower edges with which 'en-v gages acastellated washer28 on the bottom of Va bolt 29, to the upper end of which the yrod 24'is pivoted, as shown at 30, so that the distance of the .rod 24 fromV the shaft 13 can running board-25 a coil spring 38 situated be readily varied by shifting the bolt 29 along the slot'v26. As' showniny Fig. 3, the upper end of this rod 24 may carry above the betweentwo washers,and a winged nut 39 above the latter, so that by screwing the latter down the rod 2lf`the'frame 10 can be rocked Vabout its pivot 22to bringthe discs 11 into driving engagement with the road' wheel serving to drive it.

Instead of or as well as using the rod 24 for Amoving the pump towardsthe road wheel to press the friction discs into driving contactn withthe road wheel any other convenient means, such as a lifting jack 31, maybe provided for the same purpose.A As illustrated,

a bracket 32 threaded on the lspindle 33 of the manually operatable screw jack 31 is Vpivotedto swing vertically about the axle 311 of the discs 11, a stop 35 being provided on the Vend of the frame 10 for limiting the upward movement of the jack towardsthe road wheel. The spindle 33. Vhasin its periphery several grooves 36 into whicha set screw 37 movable in the bracket 32 can enter for rapidly varying the-operative lengthof the jack without turningV its handwheel. When the jack is not in use it maybe laid alongside the frame 10, asshown in ,broken lines in Figure 1, and be tied to the frame by-a strap .50 or'the like.

When the rod 24 is provided in addition to the liftingjack the rod 24 may serve to hold the pump in an inoperative position below the running board when theY pump `is not inuse, and prevent it from swinging downwards about thepivot 22 so' farV as to come incontact with the ground vEach cylinder 14 vmay have at itsv end remote from the friction' discsll a 'down- -wardly-directed delivery tube 40 provided g with a check-valve 41 Vfor connectionY each to one. branch tube Ll2 of two such Vtubes prof vided at one end of a flexible tube that can Vbe connected at its other end to the tire to be inflated.A

The described double-barrelled pump can be readily attached to and detached from a motor-car of any desired construction Without interfering in any wayiwith themechanical construction Aof. the car, the only alteration being the addition of the bearing bracket 20 on the underside of the runningboard and a hole in the latter for the rod 24:. The pump can be placed in position on'the running 'board in `a very short time `and after "it has been jackedup, or brought by the rod fri-*24 into driving engagement with an inflated road wheel, and the' engine has been started with the endy of the-car jerked up off the ground, it will pump up a pneumatic tire of the largest size in a short time. When the pump is in use the engine and parts driven' thereby run inthe ordinary manner and are not subjected to any 'unusual stresses differing from those set up under lordinary running conditions.

I claim:

1. In a pump, the combination of a cylinder, a piston therein, driving means for the piston comprising at least one friction disc to be frictionally driven by aroad wheel of a vehicle,` a movable supporting frame arranged to be pivotally mounted for engaging the disc with the road wheel, and lifting means arranged to bearon the ground and move the frame about its aXis of pivoting towards .the said road wheel to press Vthe oneV or Vmore friction discs into drivingcontact therewith. i Y

2. VIn a pump, the combination of acylinder, a piston therein, driving means for the piston comprising at least one friction disc to be frictionally driven by aroadwheel of a'vehicle, a movable supporting framearranged to be pivotally mounted atV one end for engaging thedisc or discs with Ythe road wheel, and a lifting jack attached to said frame at a situation lying towards the other end there-V of for swinging theiframe about itsaXisroff jack pivotally attached to said frame to swing aboutV the axis ofV rotation of the friction discl or discs,` and arranged to swing the frame about its aXis ofpivoting towards the said road `wheel Vto press the one or more friction discs into driving engagement therewith.

In testimony whereof I affix` signature.

CHARLES DENTON STEEL.` Y

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